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They appear at level 50-52 in the lake of outrage, 2% chance during storm weatherwhich you can reach after unlocking surf after gym 6. However, the badge only lets you catch Pokemon up to level 50 and the next badge is like literally 20 minutes away including time taken to traverse the route and actually beat the gym leader, so you might as well get he 7th badge.
Overworld encounter Drakloak are much easier to spawn though, and they come at level 55-58, so instead of praying the drakloak is at level 55, you might as well get the 8th badge first so you can catch Pokemon of all levels.Why? Because including time taken to actually fight the leader, the 8th badge is literally about 20 minutes from the 7th gym.
Game is actually this empty btw
